Parallelism of section lines within a single object For a given object or part, section lines in all hatched areas representing that object should be parallel and consistent across views.

Introduction / Context:
Consistency in hatching is crucial for visual integrity. When an object appears in multiple sectioned areas or across several views, keeping the hatch lines for that single object parallel and uniform helps readers immediately recognize that these areas belong to the same component.

Given Data / Assumptions:

• The same physical part appears sectioned in more than one location or view.
• General-purpose hatching is used rather than unique material patterns.
• Adjacent, different parts may lie next to each other in the same section view.

Concept / Approach:
The rule of thumb: identical parts receive identical hatching; a single part maintains parallel, consistent section lines wherever it appears. To distinguish adjacent different parts, vary hatch angle or spacing between parts—but do not vary within the same part. This balance maximizes both recognition and contrast.

Step-by-Step Solution:

Verification / Alternative check:
Review plotted outputs: readers should be able to trace all occurrences of one part by recognizing consistent section orientation. This reduces misinterpretation during manufacturing and QA.

Why Other Options Are Wrong:
“Incorrect” contradicts standard practice. Limiting the rule to assemblies, scales, or material-symbol cases is unfounded; consistency benefits apply broadly.

Common Pitfalls:
Accidentally changing hatch angle for the same part in different views, using too fine a pitch that fills in at plot scale, or failing to contrast adjacent parts leading to visual confusion.

Final Answer:
Correct